to output the x,y,z values of accelerometer sensor to csv format using python

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I have been able to output the data into a csv file but the new values of x,y,z overwrite the previous values. I need to put those new values in next row. I used following program for that purpose. Its not a whole program but the part I am concerned with.

while(1):
   adxl345 = ADXL345()
   axes = adxl345.getAxes(True)
   print "ADXL345 on address 0x%x:" % (adxl345.address)
   print "   x = %.3fG" % ( axes['x'] )
   print "   y = %.3fG" % ( axes['y'] )
   print "   z = %.3fG" % ( axes['z'] )

   import csv
   myFile = open('data.csv', 'w')  
   with myFile:  
     myFields = ['x', 'y', 'z']
     writer = csv.DictWriter(myFile, fieldnames=myFields)    
     writer.writeheader()
     writer.writerow({'x' : axes['x'], 'y' : axes['y'], 'z' : axes['z']})

Thank You

From https://docs.python.org/2/library/functions.html#open

Modes 'r+', 'w+' and 'a+' open the file for updating (reading and writing); note that 'w+' truncates the file. Append 'b' to the mode to open the file in binary mode, on systems that differentiate between binary and text files; on systems that don’t have this distinction, adding the 'b' has no effect.

So your open() call truncates the file. You should open the wile using a+ for appending to the file.

[PDF] accelerometer Documentation, I have been able to output the data into a csv file but the new values of x,y,z overwrite the previous values. I need to put those new values in  Remember you can use any available analog inputs for the X, Y, Z outputs. Be sure that these analog inputs are tolerant of up to 3.3 volt input (the Feather and Metro M0 powered by 3.3-5V as shown will be tolerant)!

You are opened the file object for writing mode 'w' make it in append mode and check it. like this,

myFile = open('data.csv', 'a')

Getting Started with Adafruit Circuit Playground Express: The , Dependancies include: unix, java 8 (Java 8 JDK) and python 3.7 Detailed information about XYZ acceleration, Extract calibrated and resampled raw data .csv.gz file from raw .cwa file: Clipped values, which occur when the sensor's dynamic range of +-8g is exceeded, are flagged before and after. Running this program will display the default sensor values. In this case, it is sitting on a flat desk (in other words, 0 degrees of tilt). While stable, the X axis shows 498, the Y axis shows 536, and the Z axis returns a value of 750. Reading the Orientation. Using the values in figure 4 as an example, let’s determine the orientation of

Clearly when you open a file in "w" mode it will overwrite everything that was in that file before. So if you do not want to overwrite and just stick new values at the end of a file, you obviously need to open the file in "a" mode.

myFile = open('data.csv', 'a')

Hope my answer solved your question?.

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Using an Arduino and Python to Plot/save Data : 5 Steps , IMUSim: Simulating inertial and magnetic sensor systems in Python Martin Ling later on we will create a python live plot from an automatically updating csv file. that output data over pulse-width modulation (PWM) output square waves with a the x, y, and z accelerometer data, and the associated class class values. The raw values from the accelerometer are multiplied by the sensitive level to get the value in G. Let's use FS ±2 g as an example sensitivity level. As the range is -2 to +2, this would be a total of 4g.

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